JPH0456921A - Color liquid crystal display panel - Google Patents

Abstract

PURPOSE:To improve the quality and yield of a substrate with a filter by dividing a black matrix layer into plural areas which are electrically insulated with slits. CONSTITUTION:The peripheral parts of the black matrix layer 10a is divided with slits 100a and internal picture elements are divided with slits 100b to arrange and form many separated area 101 at the peripheral part and many separated areas 101b inside. Therefore, even if partial bridging is caused by a conductive foreign body, a voltage drop at a transparent electrode can be limited to a small divided area and deterioration of the display quality can be minimized. Consequently, the quality and yield of the substrate with the color filter can be improved.

Description

[Detailed Description of the Invention] [Summary] Regarding a color liquid crystal display panel, the present invention aims to improve the quality and yield of a substrate with a color filter for a color liquid crystal display panel used in a color liquid crystal display device. a transparent substrate on which are sequentially formed, a transparent substrate on which at least a black matrix layer forming a non-pixel portion, a color filter layer, a top coat layer, a transparent electrode, and an alignment film are sequentially formed. A color liquid crystal display panel in which liquid crystal is injected and sealed into the space formed between both transparent substrates, and the black matrix layer is electrically insulated by a slit. The color liquid crystal display panel is configured to be divided into a plurality of regions.

Further, a color liquid crystal display panel in which an insulating layer is interposed between the black matrix layer and the top coat layer, or a transparent insulating layer is provided between the entire surface including the black matrix layer and the pixel portion and the top coat layer. This constitutes a color liquid crystal display panel in which a transparent insulating layer is interposed between opposing surfaces of the top coat layer, transparent electrodes, and alignment film.

[Industrial application field]

The present invention relates to a color liquid crystal display panel, particularly to an improvement in the structure for improving the quality and yield of a color filter-equipped substrate using a chrome black matrix in a non-pixel area.

In recent years, the development of display devices has been remarkable, and in particular, flat displays have rapidly become popular due to their thinness and light weight. Among them, liquid crystal display devices have a low driving voltage and are inexpensive, so they are being actively introduced into the field of office automation equipment such as personal computers and word processors.

Recently, black and white liquid crystal display devices using double cells and retardation films have been developed and used. However, in the future, there is a desire for the development of color liquid crystal display devices capable of color display, and for this purpose, it is important to develop high-quality, high-yield substrates with color filters.

[Conventional technology]

A simple matrix type and an active matrix type are known as typical color liquid crystal display devices. Although the active matrix method has excellent display quality, it has the drawbacks of difficult manufacturing technology and high cost.

On the other hand, although the display quality of the simple matrix method is inferior to that of the active matrix method, it has the advantage that it can be manufactured at a low cost.

In either case, three color filters of R (red), G (green), and B (blue) are arranged in the pixel area, and the pixels of these three colors are driven appropriately to mix colors and display any color. It is something that can be done.

FIG. 6 is a diagram showing an example of the structure of a color liquid crystal display device.
This is a display element configuration in the case of a simple matrix method using an edNematic type liquid crystal and a phase difference compensation element to compensate for coloration due to its birefringence effect, and the present invention, such as an electrode lead-out portion, a drive circuit, and a light source. Parts that are not directly related to this have been omitted.

In the figure, 50 is a color liquid crystal display panel in which striped transparent electrodes are arranged orthogonally to form matrix intersections, and is a display (driving) panel that switches light depending on whether or not a voltage is applied at each intersection. .

Reference numeral 60 denotes a phase difference compensation element, and the figure shows the case of a compensation liquid crystal panel, in which transparent substrates 61, 62 and alignment films 63.
65 is formed, the side substrates are hermetically sealed with alignment films 63 and 65 facing each other with a spacer (not shown) in between, and liquid crystal 64 is injected and sealed between both substrates, thereby forming a color liquid crystal display panel 50. It functions to compensate for and restore the coloring caused by the wavelength dispersion of the phase difference that occurs in the light that passes through the liquid crystal layer.

Note that the retardation compensation element 60 is not limited to a compensation liquid crystal panel, and may function similarly even if a retardation film using a plastic film with refractive index anisotropy (for example, a polycarbonate film) is used. is publicly known.

Reference numeral 70 denotes a polarizing plate disposed at both ends 1, that is, the light input/output end face, which is necessary for switching the light depending on the presence or absence of voltage application at the matrix intersection of the transparent electrodes of the color liquid crystal display panel 50 as described above. be.

FIG. 7 is a sectional view showing the structure of a conventional color liquid crystal display panel, and the structure is illustrated in an easy-to-understand manner.

In the figure, 1 is a transparent substrate made of, for example, a glass substrate;
10 is a black matrix layer formed on the transparent substrate 1, and is made of chromium (Cr) to prevent light from leaking in non-pixel areas.
It is made of a thin film and allows light for forming the pixel portion to pass therethrough. For example, holes on the order of 300×100 pm are provided. 13 is a color filter layer formed in the hole which becomes the pixel part of the black matrix layer lO, for example, 1
3R is R (red), 13G is G (green), 13B is B (
The three pixel portions (blue) are arranged to form a color pixel. 14 is a top coat layer, which is an insulating layer for flattening the surface. 11 is, for example, ITO (In
It is a striped transparent electrode made of 0.35 nOz), and is covered with an alignment film 12, which is formed by, for example, coating a polyimide resin film and then brushing it with a nylon brush to perform an alignment treatment.

The above laminated structure constitutes one substrate (substrate with color filter) of the color liquid crystal display panel 50, and the other substrate is similar to a normal black and white substrate.

For example, a striped transparent electrode 2 is formed on a transparent substrate 2.
1 and alignment film 22 are sequentially formed, and the substrates are arranged orthogonally so that both transparent electrodes 11 and 21 face each other to form an x-y matrix intersection, and both substrates are connected with a sealing material with a spacer 3 in between.゛After sealing, liquid crystal 4. is placed in the space between both substrates.
For example, 5TN (Super TwistedNem
A color liquid crystal display panel 50 is formed by injecting liquid crystal of the atomic type and sealing it.

FIG. 8 is a diagram showing an example of the configuration of a conventional substrate with a color filter, in which (a) is a top view and (b) is a cross-sectional view.

As the black matrix layer 10, a chromium (Cr) fit film, which is commonly used in vapor deposition masks, is preferred because of its excellent performance and quality.

For example, after sputtering to a thickness of 1100n,
Holes that become pixels are formed with a predetermined size and arrangement using normal photolithography technology. Then, color filter layers 13 (13R, 13G, 13B) cover the holes that become pixels.
) is formed to a thickness of about 1°6 μm by, for example, a pigment dispersion method (for example, Mabe, Yamaguchi).

(In: Electronic Materials, February 1990 issue, p. 23). A top coat layer 14 with a thickness of 2 μm, for example, is applied thereon as a top coat layer 14.
A polyimide resin layer of m is formed to flatten the surface.

A striped transparent electrode 11 made of, for example, ITO (Ir+20.-5 nOz) with a thickness of 170 nm is formed on the flattened top coat layer 14, and an alignment film (not shown here) is further formed. A substrate with a color filter is manufactured by applying the above steps.

[Problem to be solved by the invention]

However, in the structure of the conventional color filter-equipped substrate described above, it may be contaminated by conductive foreign matter during the manufacturing process of the laminated structure. (for example, fine particles of iron or copper) are connected to the black matrix layer 10 and the transparent electrode it.
There may even be instances where a short circuit occurs between the two. Normally, the black matrix layer 10 is formed from a Cr film, so it has conductivity, and as described above, the black matrix layer 10 and the transparent electrode 11 are
If the line is bridged, a sufficient driving voltage is not applied to the liquid crystal layer due to a voltage drop in the transparent electrode 11 in that area or in the vicinity of that line, resulting in serious problems in display quality such as color display defects such as color unevenness and a decrease in contrast. A problem had arisen and a solution was needed.

[Means to solve the problem]

The above problem is caused by the striped transparent electrode 21 and the alignment film 2.
2, a black matrix layer 10 forming at least a non-pixel portion, a color filter layer 13, a top coat layer 14, a transparent electrode 11, and an alignment film 1.
2 are successively formed on the transparent substrate 1, and the transparent electrodes 11.
21 are orthogonally arranged with spacers 3 in between so as to form matrix intersections, and the liquid crystal 4 is injected and sealed into the space formed between both transparent substrates 1.2. The matrix layer 10 has slits 10
This can be solved by a color liquid crystal display panel characterized by being divided into a plurality of electrically insulated regions 101 according to the invention.

In addition, a black matrix layer 10 and a top coat layer 14
A color liquid crystal display panel characterized in that an insulating layer 102 is interposed between the black matrix layer 10 and the black matrix layer 10.
A color liquid crystal display panel characterized in that a transparent insulating layer 103 is interposed between the entire surface including the pixel portion and the top coat layer 14, and the top coat layer 14 and the transparent electrode 1.
A transparent insulating layer 10 is formed between the facing surfaces of 1 and the alignment film 12.
This problem can also be solved by using a color liquid crystal display panel or the like, which is characterized in that 4 is interposed therebetween. moreover,
The problem can be more effectively solved by a color liquid crystal display panel that combines at least two of these means.

[Effect]

According to the configuration of the present invention, the black matrix layer 10 is divided into a plurality of electrically insulated regions 101 by the slits 100, so that in the unlikely event that a conductive foreign object 80 or 9
Even if the transparent electrode 11 is partially bridged by zero, the voltage drop across the transparent electrode 11 can be limited to a small divided area, and deterioration in display quality can be minimized. Further, an insulating layer 102, a transparent insulating layer 103 . By interposing the transparent insulating layer 104 etc., the conductive foreign matter 8
0 and 90 black matrix layer 10 and transparent electrode 1
1 can be prevented from shorting. Furthermore, by combining the above-mentioned plurality of means, it is possible to further enhance the effect.

〔Example〕

FIG. 1 is a top view (partially enlarged view) showing the first embodiment of the present invention.
Two modified examples are shown in Figures (A) and (B). For example, the peripheral part of the black matrix layer 10a in Figure (A) is divided by slits 100a, and the spaces between internal pixels are divided by slits 100b. A large number of separated regions 101a in the periphery and a large number of separated regions 10 in the interior are separated.
1b, and are arranged and formed on a transparent substrate (not shown).

Next, in the case of the same figure (b), the black matrix layer 10
The peripheral part of b is rough) 100a is roughly divided,
The internal pixels are similarly divided somewhat coarsely by the slit 100b, which is even more so than in the case of (a) in the same figure! large area 101
c, 101d, 101e, etc., and are arranged and formed on a transparent substrate (not shown).

By constructing a color liquid crystal display panel using the black matrix layer 10 divided into a large number of regions 101 by the slits 100, color unevenness and deterioration of contrast can be avoided even when conductive foreign matter is present, compared to conventional methods. We were able to make a huge improvement in comparison.

FIG. 2 shows a second embodiment of the present invention, in which (a) is a top view (only the black matrix layer and the insulating layer are shown), and (b) is a cross-sectional view.

In the figure, 102 is an insulating layer (an opaque material may be used) formed on the black matrix layer 10. For example, a 5i02 sputtered film with a thickness of 200 nm.

Note that the same reference numerals are given to the same parts as those explained in the above aspects, and the explanation of the same parts will be omitted.

How to specifically manufacture such an insulating layer 102.

For example, on a transparent substrate 1 made of a glass substrate or the like,
For example, a Cr film with a thickness of 1100 nm and a SiO□ film with a thickness of 200 nm are formed thereon by sputtering, a photoresist is applied thereon, and then photo-etched to form holes in the portions that will become pixels. Next, using the resist pattern as a mask, the SiOg film is dry etched using, for example, Freon gas, and further,
The underlying Cr film may be chemically etched using the same resist pattern as a mask, and then the resist may be removed. After that, the color filter layer 13 and other layers are laminated to produce a color filter-equipped substrate.

By forming such an insulating layer 102, even if a conductive foreign substance were to be present in the laminated structure, a short circuit between the black matrix layer 10 and the transparent electrode 11 can be prevented, compared to the conventional example. The quality is improved and the yield is greatly improved.

Note that the insulating layer 102 is not limited to Sin or a film, and it goes without saying that silicone resin and other various materials (an opaque material may also be used) can be used, for example.

FIG. 3 is a sectional view showing a third embodiment of the present invention. In the figure, reference numeral 103 denotes a transparent insulating layer that covers the entire surface including the black matrix layer 10 and the pixel portion on the transparent substrate 1, and the top coat layer 1.
It was formed to be interposed between 4 and 4. For example, it is a Si0g sputtered film with a thickness of several 1100 nm.

Note that the same reference numerals are given to the same parts as those explained in the above drawings, and the explanation of the same parts will be omitted.

In this embodiment, a black matrix layer 1 is formed on a transparent substrate 1.
After forming 0, it is sufficient to form a SiO□ sputtered film on the entire surface, so there is a constraint that the material must be transparent. Compared to the case of the second embodiment, the manufacturing process is much easier. It has the advantage of being easy and inexpensive. It goes without saying that the effect is similar to that of the previous embodiment.

FIG. 4 is a diagram showing a fourth embodiment of the present invention.

In the figure, 104 is a transparent insulating layer formed so that the top coat layer 14 and the transparent electrode 11 or the alignment film 12 are interposed between opposing surfaces. For example, Si with a thickness of several 1100 nm
It is an O□ sputtered film.

In this embodiment, the top coat layer 14. That is, since it is only necessary to form the transparent insulating layer 104 to the required thickness after forming the flattening layer, the film formation is stable, and a high-quality transparent insulating film without defects can be obtained. It has the advantage of providing an insulating effect.

FIG. 5 shows a fifth embodiment of the present invention.

This embodiment is an example in which the means shown in the third and fourth embodiments are combined and applied. That is, the transparent insulating film 103 and the transparent insulating film 104 are interposed and formed at respective positions and by respective methods as described above, and thereby synergistically prevent troubles such as short circuits caused by the conductive foreign substances 80 and 90. The effect is increased several times.

Note that in the above embodiment, the transparent insulating film 103 and the transparent insulating film 1
Although the case of combination with 04 has been illustrated and described, the present invention is not limited to this, but by combining at least two of the means described in the first to fourth embodiments, It goes without saying that each layer effect is enhanced.

The embodiments described above are merely examples, and it goes without saying that preferred materials, configurations, manufacturing processes, etc., or combinations thereof may be used as appropriate, as long as they comply with the spirit of the present invention. .

〔Effect of the invention〕

As explained above, according to the configuration of the present invention, the black matrix layer 10 is divided into a plurality of electrically insulated regions 101 by the slits 100, so that in the unlikely event that the black matrix layer 10 is partially damaged by the conductive foreign matter 80 or 90. Even if the transparent electrode 11 is bridged, the voltage drop across the transparent electrode 11 can be limited to small divided areas, and deterioration in display quality can be minimized. Further, an insulating layer 102 is provided between each predetermined eyebrow. Transparent insulating layer 103. By interposing the transparent insulator 11104 or the like, short circuit between the black matrix layer 10 and the transparent electrode 11 due to the conductive foreign substances 80 and 90 can be prevented. Furthermore, by combining the above-mentioned plurality of means, it is possible to further enhance the effect, which greatly contributes to improving the quality and yield of color liquid crystal display panels.

[Brief explanation of drawings]

FIG. 1 is a top view showing a first embodiment of the invention, FIG. 2 is a diagram showing a second embodiment of the invention, FIG. 3 is a sectional view showing a third embodiment of the invention, and FIG. 5 is a diagram showing a fourth embodiment of the present invention, FIG. 5 is a diagram showing a fifth embodiment of the present invention, FIG. 6 is a diagram showing a structural example of a color liquid crystal display device, and FIG. 7 is a diagram showing a conventional color liquid crystal display device. FIG. 8 is a cross-sectional view showing the structure of a display panel. FIG. 8 is a diagram showing an example of the structure of a conventional color filter-equipped substrate. In the figure, 1.2 is a transparent substrate, 3 is a spacer, 4 is a liquid crystal, 10 (10a, 10b,) is a black matrix layer, 1
1.21 is a transparent electrode, 12, 22 is an alignment film, 13 (13R, 13G, 13B) is a color filter layer,
14 is a top coat layer, 50 is a color liquid crystal display panel, 80.90 is a conductive foreign substance, 100 (100a, 100b) is a slit, 101
(101a, 101b, 101c, 101d,
101e) is a region, 102 is an insulating layer, and 103 and 104 are transparent insulating layers. AugAI) iB real! fsl, T; TflWii Drawing 3 (b) Top view showing the first example of failure of the present invention Fig. 1 (0'/3 4th flag of this defense 1 column Σ H 1 Fig. 4; Figure 5 shows the 5th row of the 5th fruit in Ming A. Figure 5 shows the structure of the color liquid crystal display device.
1 cross-sectional diagram of a conventional color liquid crystal display panel'7
Reverse (A) Top view (0) @ Top view 4# of conventional board with color filter! Example Σ diagram 8

Claims (5)

[Claims] (1) Striped transparent electrode (21) and alignment film (22)
), a black matrix layer (10) forming at least a non-pixel area, a color filter layer (13), a top coat layer (14), a transparent electrode (11), and an alignment film ( 12) are arranged orthogonally with a spacer (3) in between so that the transparent electrodes (11, 21) form a matrix intersection. A color liquid crystal display panel (4) in which liquid crystal (4) is injected and sealed into a gap-like space formed between
50), wherein the black matrix layer (10) has slits (100
), a plurality of regions (101) electrically insulated by
A color liquid crystal display panel characterized by being divided into . (2) The transparent substrate (
1) A color liquid crystal display panel characterized in that an insulating layer (102) is interposed between an upper black matrix layer (10) and a top coat layer (14). (3) The transparent substrate (
1) A color liquid crystal display panel characterized in that a transparent insulating layer (103) is interposed between the entire surface including the upper black matrix layer (10) and the pixel portion and a top coat layer (14). (4) The transparent substrate of the color liquid crystal display panel (50) (
1) A transparent insulating layer (104) is interposed between the opposing surfaces of the top coat layer (14), the transparent electrode (11), and the alignment film (12) of the above laminated structure. Color LCD display panel. (5) A color liquid crystal display panel characterized in that at least two of the means described in claims (1) to (4) are combined.